grade 1 titanium bar Marine titanium welding process

In recent years, many new ships began extensive use of titanium alloy . With the increase in the amount of grade 1 titanium bar , shipyard welding to enhance efficiency , product quality and stability , the need to develop some efficient titanium welding process. TA5 two kinds of titanium Shanghai Jiangnan Shipbuilding in thickness of 4mm Ti70 and 16 mm for welding object, plasma arc welding , laser welding and laser - arc hybrid welding titanium welding three high energy density of the process carried out explore, get the excellent performance of welded joints
A plasma arc welding
Plasma arc welding is the use of plasma arc welding method as a heat source . Gas heated by the arc generated from the solution , a nozzle at high speed compressed by water , and increasing the energy density of the solution from forming a plasma arc. Its stability , heat and temperature are higher than the arc , and thus has a greater penetration power and welding speed . For marine titanium welding tests show that plasma arc with concentrated energy , penetration , side welding good shape , no tungsten inclusions , less porosity , etc. , it is very suitable for welding of titanium and titanium alloys . More plasma arc welding process parameters , when the method is mainly related to the use of orifice nozzle diameter , welding current, plasma gas flow rate , welding speed , shielding gas flow.
Second, laser welding
Laser welding is a focused laser beam as the heat energy generated by the bombardment of the weldment for welding a high -precision welding method . Laser welding due to the high energy density, obtained greater penetration and high welding speed , and because the diameter of the laser beam is extremely small, so narrow weld and heat -affected zone , the welding residual stress and deformation is small . The main parameters of laser welding laser welding power , welding speed , defocusing amount , side-blown gas flow and shielding gas flow. Since the laser welding high welding speed , the welding process generally can not adjust the parameters of the process ,grade 2 titanium  so before the formal optimum welding parameters to be determined by a combination of pre- experiments.
Third, the laser - arc hybrid welding
Compared with conventional arc welding and laser welding, laser - arc hybrid welding weld penetration with a large , high process stability , high welding efficiency , strong weld gap bridging ability and welding deformation , etc., can greatly improve the welding efficiency and weld quality. Laser - arc hybrid welding can reduce the workpiece machining accuracy requirements groove welds may be improved over time high laser welding shortage and liquid bath due to higher absorption of the laser beam , laser welding can be compared greater penetration and a higher welding speed . Using laser - arc hybrid welding , laser and arc due to the presence of two heat sources , and each heat are more parameters to be adjusted , so make the laser and arc harmonic match with a lot of tests need to be explored .
Jiangnan Shipbuilding technology test results conducted show that plasma arc welding , laser welding and laser - arc hybrid welding excellent joint performance of the welded test plate . Process repeatability, low level requirements for welders , titanium grade 1 it is very suitable for the production of large quantities of rules seam welding. Mechanical test results showed that: the mechanical properties of butt joints meet the standard requirements, joint strength and ductility in the match with a reliable base metal Ti70; plasma arc welding and laser - arc hybrid welding using low intensity TA10 wire welding Ti70 plates, welding joint seam strength far exceeds the requirements of matches with Ti70 , which makes titanium alloy welding consumables when marine greatly broaden the range of options available in between strength and ductility, toughness seek to better balance.

xinnuo titanium grade with a metallic luster

Titanium is a chemical element with the symbol Ti, atomic number 22 , is a silvery-white transition metal , characterized by light weight , high strength , with a metallic luster , have a good corrosion resistance ( including sea water, aqua regia and chlorine ) . [ 1 ] Due to its chemical stability , excellent high temperature, low temperature resistance, anti- acid, anti- alkali and high-strength , low density , Known as "space metal ." Titanium in 1791 in Cornwall, England discovered by Gregor by Klaproth for the Titans of Greek mythology with the name .
Titanium is considered a rare metal , which is due to the presence of a dispersion in nature and difficult to extract . But its relative abundance ranks tenth in all elements. Titanium ores ilmenite and rutile are mainly widely distributed in the earth's crust and lithosphere being . Titanium also exists in almost all living organisms , rocks, water , and soil. The main ore extracted from the need to use titanium Kroll process or the Hunter process . The most common compounds are titanium dioxide, a white pigment can be used in the manufacture . Other compounds include titanium tetrachloride (TiCl4) ( as a catalyst for the manufacture of smoke or air and text ) and titanium trichloride (TiCl3) ( for the catalytic production of polypropylene ) . [ 2 ]
The two most useful properties of titanium , the corrosion resistance , the highest intensity and metal - weight ratio. In unalloyed condition, titanium strength comparable with some of the steel , but also 45% lighter . There are two allotropes and five natural isotopes from Ti to Ti, which is the highest abundance of Ti (73.8%). Chemical and physical properties similar to titanium and zirconium , which is the same as the number of valence electrons of the two, and belong to a family in the periodic table .